intel/82801dx: Move HAVE_HARD_RESET to southbridge

intel/82801dx: Move HAVE_HARD_RESET to southbridge

No in-tree 82801dx-using board has it not selected, so move
selection from boards to southbridge.

Change-Id: I69671cb6411a6cd9c791059ae9546dff3aff702c
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/655
Reviewed-by: Marc Jones <marcj303@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>